Sedimentation of harmful dust by means of ultrasonic waves and additional disperse phase

Abstract

The harmful effect on the health of superfine dust in industry is a serious problem. An especially important and complex task is the development of new methods for sedimentation of dust particles with a characteristic size of less than 10 μm. The solution offered by the authors involves a combined method of impact on industrial dust using highfrequency acoustic fields and spraying of a superfine water aerosol. Acoustic radiation sources are successfully applied to cleaning rooms from dust having fairly large particle sizes (10 μm and larger). The sedimentation of fine aerosols (particle diameter of 1-10 μm) is a more complicated challenge. The paper is devoted to substantiation of the acoustic sedimentation method for such aerosols. Good results were achieved when additional disperse phase was applied together with the ultrasonic source. Calculation results according to the mathematical model for coagulation and sedimentation, based on Smoluchowski's equation, taking into account evaporation of liquid droplets, are given. Results of the experimental and theoretical study of the processes of acoustic sedimentation of superfine aerosols are presented. Recommendations are offered for the use of sources of ultrasonic radiation and sprayers of water aerosol for optimum removal of dust from workplace air.

Agglomeration of aerosol using small equipment with two small aerial ultrasonic sources

“…[1][2][3][4] Because aerial ultrasound uses ultrasonic energy propagating in a gas, it is employed in non-contact technologies such as drying, atomization, and levitation by ultrasonic waves. [5][6][7][8][9][10][11][12][13][14][15] In addition to these techniques, ultrasonic agglomeration [16][17][18] induces agglomeration by irradiating aerial particles with ultrasonic waves, which vibrates the particles and induces collisions between them. Brant et al clarified the principle of ultrasonic agglomeration.…”

Symmetry in Aerosol Mechanics: Review

“…The coagulation model (22) described hereinabove has to be accompanied by the initial condition of the following form in order to take into account the second phase [58]:…”